steel-lord/render.go

package main

import (
	"github.com/kettek/goro"
	"github.com/kettek/goro/fov"

	"steel/interfaces"
)

// DrawAll draws all entities and the gameMap to the screen and flushes it.
func DrawAll(screen *goro.Screen, entities []interfaces.Entity, gameMap interfaces.GameMap, fovMap fov.Map, fovRecompute bool, colors map[string]goro.Color) {
	if fovRecompute {
		// Draw all the tiles in the game map.
		for x := 0; x < gameMap.Width(); x++ {
			for y := 0; y < gameMap.Height(); y++ {
				visible := fovMap.Visible(x, y)

				if visible {
					if gameMap.IsBlocked(x, y) {
						screen.SetBackground(x, y, colors["lightWall"])
					} else {
						screen.SetBackground(x, y, colors["lightGround"])
					}
					gameMap.SetExplored(x, y, true)
				} else if gameMap.Explored(x, y) {
					if gameMap.IsBlocked(x, y) {
						screen.SetBackground(x, y, colors["darkWall"])
					} else {
						screen.SetBackground(x, y, colors["darkGround"])
					}
				}
			}
		}
	}

	// Draw all the entities in the game map.
	for _, entity := range entities {
		DrawEntity(screen, entity, fovMap)
	}
	screen.Flush()
}

// ClearAll clears all entities from the screen.
func ClearAll(screen *goro.Screen, entities []interfaces.Entity, fovMap fov.Map) {
	for _, entity := range entities {
		ClearEntity(screen, entity, fovMap)
	}
}

// DrawEntity draws a given entity to the screen.
func DrawEntity(screen *goro.Screen, e interfaces.Entity, fovMap fov.Map) {
	if fovMap.Visible(e.X(), e.Y()) {
		screen.SetRune(e.X(), e.Y(), e.Rune())
		screen.SetForeground(e.X(), e.Y(), e.Style().Foreground)
	}
}

// ClearEntity clears a given entity from the screen.
func ClearEntity(screen *goro.Screen, e interfaces.Entity, fovMap fov.Map) {
	if fovMap.Visible(e.X(), e.Y()) {
		screen.SetRune(e.X(), e.Y(), ' ')
	}
}